Answer / zulfiqar beg

Field symbols is like pointer in 'C'.
By the use of field symbol u can modify the internal table,
work area, user command etc without using modify keyword.
U can also modify internal table of standard program by
field symbols.
field-symbol <fs> type any.

Answer / dileep kumar chinnaiah

Adding to "Zulfiqar Beg"

A Simple example.
FS are like ATM cards while your internal tables are Bank
accounts.

any transactions you do with your ATM card will be reflected
to your account straight. (Like Pass/Call by reference)

Answer / anji yv

incase of any modifications in internal table generally we loop the internal table to workarea and we have to modify in the work area and we have to write the modify statement to modify the internal table.

if we use field symbols then automatic modification can be done with out writing modify statement..

Performance wise field symbols are much bettar than the normal work area.

REPORT ZSAPN_FIELDSYMBOLS.

DATA : IT_MARA TYPE TABLE OF MARA.
DATA : WA_MARA TYPE MARA.
FIELD-SYMBOLS : <FS_MARA> TYPE MARA.
SELECT * FROM MARA
INTO TABLE IT_MARA UP TO 50 ROWS.

LOOP AT IT_MARA ASSIGNING <FS_MARA>.
IF <FS_MARA> IS ASSIGNED.
WRITE :/ <FS_MARA>-MATNR, <FS_MARA>-MTART, <FS_MARA>-MEINS.
ENDIF.
ENDLOOP.

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